Add Project Files section and show company name for external users on project detail

src/components/Layout.jsx

@@ -63,7 +63,8 @@ function ExternalNav({ onNav }) {
   const links = [
     { to: '/dashboard', label: 'Dashboard' },
     { to: '/assigned-requests', label: 'Requests' },
-    { to: '/my-purchase-orders', label: 'Purchase Orders' },
+    { to: '/my-projects-sub', label: 'Projects' },
+    { to: '/my-invoices-sub', label: 'Invoices' },
     { to: '/file-sharing', label: 'File Sharing' },
     { to: '/survey-maker', label: 'Survey Maker' },
     { to: '/brand-book', label: 'Brand Book Maker' },
@@ -74,7 +75,7 @@ function ExternalNav({ onNav }) {
     <div className="sidebar-section">
       {links.map(({ to, label }, index) => (
         <div key={to}>
-          {index === 2 && (
+          {index === 4 && (
             <>
               <div style={{ height: 1, margin: '10px 12px', background: 'var(--border)' }} />
               <div style={{ padding: '0 12px 8px', fontSize: 11, fontWeight: 700, letterSpacing: 0.8, textTransform: 'uppercase', color: 'var(--text-muted)' }}>